| Acronym | Definition |
|---|
| FCO | Foreign and Commonwealth Office |
| FCO | Francisco (name) |
| FCO | Federal Coordinating Officer (senior official at a disaster) |
| FCO | Fixed Capital Outlay |
| FCO | Federal Cartel Office |
| FCO | Fire Control Officer |
| FCO | Full Corporate Offer |
| FCO | Field Change Order |
| FCO | Rome, Italy - Leonardo Da Vinci/Fiumicino (Airport Code) |
| FCO | Flow Control Operator (DLSW) |
| FCO | Fast Cook-Off (explosives/propellants) |
| FCO | Film Coated Offset |
| FCO | Fair Collections & Outsourcing (Beltsville, MD) |
| FCO | Fire Control Operator |
| FCO | Face-Centered Orthorhombic |
| FCO | Forms Control Officer |
| FCO | File Control Office |
| FCO | Festival Chorale Oregon (Salem) |
| FCO | Festival Chorale Oregon |
| FCO | Fire Control Order |
| FCO | Facility Control Office |
| FCO | First Class Only (United States Military Academy) |
| FCO | Firm Corporate Offer |
| FCO | Final Change Order |
| FCO | Floor Clean Out |
| FCO | Full Circles Ottawa (Ottawa, Canada) |
| FCO | Federal Career Opportunities |
| FCO | Fighter Control Operator (US DoD) |
| FCO | Flat Cut Out (lettering style, sign industry) |
| Fco | Fraction of Commercial Power Supplied by Oil |
| FCO | First Call Opportunity |
| FCO | Flight Communications Operator |
| FCO | Fussball Club Oerlikon (Swiss soccer club) |
| FCO | Field Claim Office (Insurance) |
| FCO | Fund Control Officer |
| FCO | Film Censor's Office (Ireland) |
| FCO | Franco Carrier |
| FCO | Firing Console Operator |
| FCO | Funds Certifying Official |
| FCO | Fire Coordination Office/Officer |
| FCO | Fussball Club Oberwinterthur (Swiss soccer club) |
| FCO | Football Club de l'Odet (French football club) |
| FCO | Federal Communications Office (Swiss PTT) |
| FCO | Financial Compliance Officer |
| FCO | Fotuh Construction Organization |
| FCO | Functional Check Out (various companies) |